Wait, what is PBMining? I was under the understanding that mining BTC was using w/e GPU you have to solve complex algorithms. So how can someone mine with zero power costs? GPU usage = power consumption. What am I missing here?
pbmining is cloud mining service
so you only need to buy hashrate (GHS) from them and they mine bitcoin for you for period of time
you didn't need mining hardware and cost (electricity and hosting) anymore
but some people think pbmining don't actually mining
you can see the discussion here ->
https://bitcointalk.org/index.php?topic=484355.0